<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <!-- <script src="./animate.css"></script> -->
    <script src="./vue.js"></script>
</head>

<body>
    <div id="app">

        <transition @before-enter="beforHandel" @enter="enterHandel" @after-enter="afterenterHandel">
            <div v-show="flag">hello world</div>
        </transition>
        <button @click="change">切换动画</button>
    </div>
    <script>
        new Vue({
            el: "#app",
            data: {
                flag: true,

            },
            methods: {
                change() {
                    this.flag = !this.flag
                },
                beforHandel(el) {
                    el.style.color = "red"
                },
                enterHandel(el, done) {
                    setTimeout(() => {
                        done
                    }, 4000)
                },
                afterenterHandel(el) {
                    el.style.fontSize = "16px";
                    el.style.backgroundColor = ""
                }
            },
        })
    </script>
</body>

</html>